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Segment Information - Revenue by Product Line (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 28, 2018
Oct. 29, 2017
Jul. 30, 2017
Apr. 30, 2017
Jan. 29, 2017
Oct. 30, 2016
Jul. 31, 2016
May 01, 2016
Jan. 28, 2018
Jan. 29, 2017
Jan. 31, 2016
Revenue from External Customer [Line Items]                      
Net sales $ 140,614 $ 150,304 $ 153,127 $ 143,802 $ 140,031 $ 137,185 $ 135,911 $ 131,145 $ 587,847 $ 544,272 $ 490,219
Signal Integrity [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 263,015 258,824 221,185
Protection [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 176,482 149,865 138,674
Wireless and Sensing [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 117,596 81,657 70,712
Power and High Reliability [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 46,973 59,117 54,999
Systems Innovation [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 0 205 4,649
Other: Warrant Shares                      
Revenue from External Customer [Line Items]                      
Net sales offset                 $ (16,219) $ (5,396) $ 0
Net sales revenue                      
Revenue from External Customer [Line Items]                      
Concentration risk, percentage                 100.00% 100.00% 100.00%
Net sales revenue | Signal Integrity [Member]                      
Revenue from External Customer [Line Items]                      
Concentration risk, percentage                 45.00% 47.00% 46.00%
Net sales revenue | Protection [Member]                      
Revenue from External Customer [Line Items]                      
Concentration risk, percentage                 30.00% 28.00% 28.00%
Net sales revenue | Wireless and Sensing [Member]                      
Revenue from External Customer [Line Items]                      
Concentration risk, percentage                 20.00% 15.00% 14.00%
Net sales revenue | Power and High Reliability [Member]                      
Revenue from External Customer [Line Items]                      
Concentration risk, percentage                 8.00% 11.00% 11.00%
Net sales revenue | Systems Innovation [Member]                      
Revenue from External Customer [Line Items]                      
Concentration risk, percentage                 0.00% 0.00% 1.00%
Net sales revenue | Other: Warrant Shares                      
Revenue from External Customer [Line Items]                      
Allocated share-based compensation expense as a percentage of net revenue                 (3.00%) (1.00%) (0.00%)